A drive device for a movable furniture part includes an ejecting element for moving the movable furniture part from a closed position to an open position, an ejection force accumulator that applies force to the ejecting element, and a locking device for locking the ejecting element by a locking element in a locking section. The locking device can be unlocked by overpressing the movable furniture part from the closed position to an overpressing position in the closing direction. The movable furniture part can be moved in the opening direction by the ejection force accumulator and the ejecting element, and the locking device has a pre-locking section for the locking element. The locking element is moved from the pre-locking section into the locking section via a push-through evasion section by pushing the movable furniture part during closing into a push-through position behind the closing position in the closing direction.